Github user wuchong commented on a diff in the pull request:
https://github.com/apache/flink/pull/3039#discussion_r93757413
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/TableEnvironment.scala
---
@@ -535,4 +509,74 @@ object TableEnvironment {
new ScalaStreamTableEnv(executionEnvironment, tableConfig)
}
+
+ /**
+ * Returns field names and field positions for a given
[[TypeInformation]].
+ *
+ * Field names are automatically extracted for
+ * [[org.apache.flink.api.common.typeutils.CompositeType]].
+ * The method fails if inputType is not a
+ * [[org.apache.flink.api.common.typeutils.CompositeType]].
+ *
+ * @param inputType The TypeInformation extract the field names and
positions from.
+ * @tparam A The type of the TypeInformation.
+ * @return A tuple of two arrays holding the field names and
corresponding field positions.
+ */
+ def getFieldInfo[A](inputType: TypeInformation[A]): (Array[String],
Array[Int]) = {
+ validateType(inputType)
+
+ val fieldNames: Array[String] = inputType match {
+ case t: TupleTypeInfo[A] => t.getFieldNames
+ case c: CaseClassTypeInfo[A] => c.getFieldNames
+ case p: PojoTypeInfo[A] => p.getFieldNames
+ case r: RowTypeInfo => r.getFieldNames
+ case tpe =>
+ throw new TableException(s"Type $tpe lacks explicit field naming")
+ }
+ val fieldIndexes = fieldNames.indices.toArray
+
+ if (fieldNames.contains("*")) {
+ throw new TableException("Field name can not be '*'.")
+ }
+
+ (fieldNames, fieldIndexes)
+ }
+
+ def validateType(typeInfo: TypeInformation[_]): Unit = {
+ val clazz = typeInfo.getTypeClass
+ if ((clazz.isMemberClass && !Modifier.isStatic(clazz.getModifiers)) ||
+ !Modifier.isPublic(clazz.getModifiers) ||
+ clazz.getCanonicalName == null) {
+ throw TableException(s"Class '$clazz' described in type information
'$typeInfo' must be " +
+ s"static and globally accessible.")
+ }
+ }
+
+ /**
+ * Returns field types for a given [[TypeInformation]].
+ *
+ * Field types are automatically extracted for
+ * [[org.apache.flink.api.common.typeutils.CompositeType]].
+ * The method fails if inputType is not a
+ * [[org.apache.flink.api.common.typeutils.CompositeType]].
+ *
+ * @param inputType The TypeInformation to extract field types from.
+ * @return an holding the field types.
+ */
+ def getFieldTypes(inputType: TypeInformation[_]):
Array[TypeInformation[_]] = {
+ validateType(inputType)
+
+ inputType match {
+ case t: TupleTypeInfo[_] => getTypes(t)
+ case c: CaseClassTypeInfo[_] => getTypes(c)
+ case p: PojoTypeInfo[_] => getTypes(p)
+ case r: RowTypeInfo => getTypes(r)
+ case tpe =>
+ throw new TableException(s"Type $tpe lacks explicit field naming")
+ }
+ }
+
+ private def getTypes(c: CompositeType[_]): Array[TypeInformation[_]] = {
+ 0.until(c.getTotalFields).map(c.getTypeAt(_)).toArray
--- End diff --
`c.getTypeAt(_)` can be simplified to `c.getTypeAt` .
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
